【摘要】：研究散粒體的流動(dòng)性能及其影響因素對(duì)于降低損失和貧化具有重要的意義.借鑒前人研究成果,選擇了隔離層厚度、隔離層界面摩擦系數(shù)、顆粒摩擦系數(shù)、顆粒半徑、墻體摩擦系數(shù)5項(xiàng)主要影響因素,采用正交實(shí)驗(yàn)法。建立了五因素三水平正交放礦數(shù)值模型;通過(guò)對(duì)多漏斗放礦條件下礦巖流動(dòng)規(guī)律的模擬,探討了柔性隔離層作用下多漏斗放礦流動(dòng)特性;結(jié)合多漏斗放礦試驗(yàn)特點(diǎn),選取放出量與放出體交線高度比與隔離層起伏角為評(píng)價(jià)指標(biāo).利用矩陣分析法,獲取指標(biāo)體系的權(quán)矩陣,闡明了影響因素作用規(guī)律.研究結(jié)果表明:多漏斗放礦條件下,因各放礦口間的相互影響而產(chǎn)生交錯(cuò)、缺失等不同程度的變異,放出體并不呈規(guī)則橢球體形狀;隔離層界面在放礦初期呈近似水平下移,后期彎曲起伏較大,呈圓弧形下移,直至放礦終了以波浪形懸浮于底部結(jié)構(gòu);隔離層運(yùn)動(dòng)形態(tài)對(duì)放礦效果的影響起著至關(guān)重要的作用;5項(xiàng)主要因素影響的主次順序是墻體摩擦系數(shù)、顆粒摩擦系數(shù)、顆粒半徑、界面摩擦系數(shù)、隔離層厚度;當(dāng)墻體摩擦系數(shù)為0.2、顆粒摩擦系數(shù)為0.8、顆粒半徑為0.008m、界面摩擦系數(shù)為0.8、厚度為0.005 m時(shí),放礦效果最佳.
[Abstract]:It is of great significance to study the flow performance of bulk particles and its influencing factors for reducing loss and dilution. Referring to the previous research results, the orthogonal experiment method was adopted to select five main influencing factors, such as the thickness of the isolation layer, the friction coefficient of the interface of the isolation layer, the radius of the particle and the friction coefficient of the wall. The numerical model of five-factor and three-level orthogonal drawing is established, and the flow characteristics of multi-funnel drawing under the action of flexible isolation layer are discussed by simulating the ore-rock flow law under the condition of multi-funnel drawing. Combined with the characteristics of multi-funnel drawing test, the ratio of drawing volume to drawing line height and the angle of isolation layer fluctuation are selected as the evaluation index. By using the matrix analysis method, the weight matrix of the index system is obtained, and the action rule of the influencing factors is clarified. The results show that under the condition of multi-funnel drawing, the drawing body does not show regular ellipsoid shape because of the interlaced and missing variation of each ore drawing mouth. The boundary of isolation layer moves down approximately horizontally at the initial stage of ore drawing, and the bending fluctuation is large at the later stage, and moves downward in a circular arc until the end of drawing with wave shape suspended on the bottom structure, and the movement form of the isolation layer plays an important role in the effect of ore drawing. The primary and secondary order of the five main factors are wall friction coefficient, particle radius, interfacial friction coefficient and thickness of isolation layer. When the wall friction coefficient is 0.2, the particle friction coefficient is 0.8, the particle radius is 0.008m, the interfacial friction coefficient is 0.8and the thickness is 0.005 m, the drawing effect is the best.
【作者單位】： 廣西大學(xué)資源與冶金學(xué)院;北京科技大學(xué)土木與環(huán)境工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):51464005)資助項(xiàng)目
【分類號(hào)】：TD801

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本文編號(hào)：2431982